Favourite
You can do this via 'Settings' > 'Favourites'. Choose '+' to add a Favourite Individual, Biller or Top Up.

You can also add a Favourite when paying a recipient by toggling on 'Add to Favourites' after you've filled in the recipient details.

While you're adding your Favourites, you can also set them as a Quick Link which pins them to your Home screen.

Quick Links are eligible for Quick Pay, an additional feature that lets you make payment after you've logged into the RHB Mobile Banking App.
There's no limit on the number of Favourite accounts you can add.
With Quick Links, you may access your favourite individuals, payees and top ups on the Home screen and perform Quick Pay after you've logged into the RHB Mobile Banking App. You may add a maximum of eight Quick Links.

Meanwhile, Favourites don't appear on your Home screen but you can select them when performing transaction. There's no limit to the number of Favourite accounts you can save.